build(libtmux): Update 0.10.2 -> 0.10.3 (built with poetry build)

libtmux 0.10.3 is the first version packaged with `poetry build` and
published via `poetry publish`

See also:
- https://github.com/tmux-python/libtmux/blob/v0.10.3/CHANGES
- https://libtmux.git-pull.com/history.html#libtmux-0-10-3-2022-01-10

Author: tony

poetry.lock

@@ -51,7 +51,7 @@ tmuxp = 'tmuxp:cli.cli'
 python = "^3.7"
 click = ">7,<8.1"
 kaptan = ">=0.5.10"
-libtmux = "~0.10.2"
+libtmux = "~0.10.3"
 colorama = ">=0.3.9"
 
 [tool.poetry.dev-dependencies]